Phoenix is on the cusp of something great, musically speaking. New festivals are popping up every year with big concepts and bigger headliners. As time progresses and the bands on top of the scene either blow up or fade away, it will be the younger acts out there stepping up the play the True Music Festivals, the Los Dias de la Crescents, and all of Phoenix's other terrific musical events. Though, of course, being 25 is a far cry from being washed up, we have our eye one generation younger. These are the top 10 bands and musicians under the age of 21.